Upgrading from D300

Claire, when testing strobe cables with a multi-meter, check, obviously for low impedance along each conductor. But also check for infinite impedance between the conductors. I have cables that got dampness within, and checking on a high range showed slight conductivity between some wires. And it produced all kinds of headaches until I discovered this and changed the cable.

What you describe sounds like the ancient conflict of Sync (electric) vs fiberoptic cables. My sync cables were a source of continuing trouble and failure (also for my dive buddy) so I sold my Ikelite strobes and switched to fiberoptic cables for my Inon Z240 and now S&S YS-D2 strobes.

Hi Claire:
What you describe sounds like the ancient conflict of Sync (electric) vs fiberoptic cables. My sync cables were a source of continuing trouble and failure (also for my dive buddy) so I sold my Ikelite strobes and switched to fiberoptic cables for my Inon Z240 and now S&S YS-D2 strobes.
Result: strobe firing problems are gone. Caveat: Ikelite strobes require sync cables or hybrid cables.
I made my own fiberoptic cables out of Toshiba hi-fi Toslink cable from eBay, never a problem for 4 years, reliable, cheap (under $5.) and tough.
Best of luck!

Interesting Kraken! - oh dear might be time for a strobe upgrade too......